mkarchiso: support %ARCHISO_UUID% variable in boot loader configuration

It will be replaced with the ISO's modification date in UTC, i.e.
its "UUID".

This allows to replace `archisolabel=%ARCHISO_LABEL%` with
`archisodevice=UUID=%ARCHISO_UUID%` in boot loader configurations.

Related to #202

1 files changed, 9 insertions, 5 deletions

diff --git a/archiso/mkarchiso b/archiso/mkarchiso
index e991b52..afaeb6e 100755
--- a/archiso/mkarchiso
+++ b/archiso/mkarchiso
@@ -29,6 +29,7 @@ gpg_key=""
 gpg_sender=""
 iso_name=""
 iso_label=""
+iso_uuid=""
 iso_publisher=""
 iso_application=""
 iso_version=""
@@ -446,6 +447,7 @@ _make_bootmode_bios.syslinux.mbr() {
     install -d -m 0755 -- "${isofs_dir}/boot/syslinux"
     for _cfg in "${profile}/syslinux/"*.cfg; do
         sed "s|%ARCHISO_LABEL%|${iso_label}|g;
+             s|%ARCHISO_UUID%|${iso_uuid}|g;
              s|%INSTALL_DIR%|${install_dir}|g;
              s|%ARCH%|${arch}|g" \
              "${_cfg}" > "${isofs_dir}/boot/syslinux/${_cfg##*/}"
@@ -558,21 +560,20 @@ _make_common_bootmode_grub_copy_to_isofs() {
 
 # Prepare GRUB configuration files
 _make_common_bootmode_grub_cfg(){
-    local _cfg archiso_uuid search_filename
+    local _cfg search_filename
 
     install -d -- "${work_dir}/grub"
 
-    # Precalculate the ISO's modification date in UTC, i.e. its "UUID"
-    TZ=UTC printf -v archiso_uuid '%(%F-%H-%M-%S-00)T' "$SOURCE_DATE_EPOCH"
     # Create a /boot/grub/YYYY-mm-dd-HH-MM-SS-00.uuid file on ISO 9660. GRUB will search for it to find the ISO
     # volume. This is similar to what grub-mkrescue does, except it places the file in /.disk/, but we opt to use a
     # directory that does not start with a dot to avoid it being accidentally missed when copying the ISO's contents.
-    : > "${work_dir}/grub/${archiso_uuid}.uuid"
-    search_filename="/boot/grub/${archiso_uuid}.uuid"
+    : > "${work_dir}/grub/${iso_uuid}.uuid"
+    search_filename="/boot/grub/${iso_uuid}.uuid"
 
     # Fill GRUB configuration files
     for _cfg in "${profile}/grub/"*'.cfg'; do
         sed "s|%ARCHISO_LABEL%|${iso_label}|g;
+             s|%ARCHISO_UUID%|${iso_uuid}|g;
              s|%INSTALL_DIR%|${install_dir}|g;
              s|%ARCH%|${arch}|g;
              s|%ARCHISO_SEARCH_FILENAME%|${search_filename}|g" \
@@ -821,6 +822,7 @@ _make_bootmode_uefi-x64.systemd-boot.esp() {
     mcopy -i "${efibootimg}" "${profile}/efiboot/loader/loader.conf" ::/loader/
     for _conf in "${profile}/efiboot/loader/entries/"*".conf"; do
         sed "s|%ARCHISO_LABEL%|${iso_label}|g;
+             s|%ARCHISO_UUID%|${iso_uuid}|g;
              s|%INSTALL_DIR%|${install_dir}|g;
              s|%ARCH%|${arch}|g" \
             "${_conf}" | mcopy -i "${efibootimg}" - "::/loader/entries/${_conf##*/}"
@@ -1660,6 +1662,8 @@ _set_overrides() {
     # Set variables that do not have overrides
     [[ -n "$airootfs_image_type" ]] || airootfs_image_type="squashfs"
     [[ -n "$iso_name" ]] || iso_name="${app_name}"
+    # Precalculate the ISO's modification date in UTC, i.e. its "UUID"
+    TZ=UTC printf -v iso_uuid '%(%F-%H-%M-%S-00)T' "$SOURCE_DATE_EPOCH"
 }
 
 _export_gpg_publickey() {